沥青混合料离析的评价模型与评价标准  

Evaluated model and standard of segregation for asphalt mixture

作　　者：唐娴[1,2] 王社良[1] 戴经梁[3] 

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]陕西交通职业技术学院公路工程系,陕西西安710018 [3]长安大学公路学院,陕西西安710064

出　　处：《交通运输工程学报》2010年第2期1-5,共5页Journal of Traffic and Transportation Engineering

基　　金：陕西省教育厅2009年度重点实验室重点科研计划项目(09JS024);陕西省交通科技项目(08-21k)

摘　　要：采用颗粒力学的基本理论分析了颗粒相互作用时的运动规律,以沥青混合料堆积形成的休止角建立沥青混合料离析模型,推导出沥青混合料的离析势能指数计算公式,开发了沥青混合料离析测定仪,测定了贝雷设计法公称最大粒径16 mm的离析势能指数,并通过试验提出公称最大粒径16 mm的沥青混合料离析标准。试验结果表明:在CA0.5级配附近,沥青混合料的压实比约为0.40,离析势能指数约为0.200,两者都存在一个最小值,且沥青混合料具有良好的压实性和工作稳定性,在施工过程不易发生离析,依据评价标准将沥青混合料离析划分为无离析、轻微离析、中等离析和严重离析,该评价模型和评价标准可用于沥青混合料离析的现场检测和判别。The behavioral laws among particles were analyzed by using the fundamental theory of particle mechanics.A segregation model of asphalt mixture was established by using the angle of repose when it was piled.The calculation equation about the segregation index of potential energy was deduced.The index instrument was developed.The segregation index for asphalt mixture with maximum nominal particle size 16 mm was detected,and the standard of the segregation index was summarized by comparing test under different temperature conditions.Test result shows that the segregation index of potential energy is about 0.200,the compaction rate is about 0.40 near CA0.5,and they have least values.The mixture holds good workability and compacted-ability,which can decrease sharply the segregation during construction.The segregation grades of asphalt mixture are divided into no segregation,low segregation,middle segregation and high segregation in view of the standard.So the evaluated model and standard can be used to detect and differentiate the segregation of asphalt mixture at the spot.4 tabs,2 figs,10 refs.

关 键 词：路面材料 沥青混合料 离析模型 离析势能指数 离析等级 

分 类 号：U414.75[交通运输工程—道路与铁道工程]